Finding the Fourth Proportional to 260,104.72, 390,128.72 and 176,402.56

Step by Step Solution

1. Step 1: Write the proportion equation
   260,104.72 : 390,128.72 = 176,402.56 : x
2. Step 2: Convert to fraction form
   260,104.72/390,128.72 = 176,402.56/x
3. Step 3: Cross multiply
   260,104.72x = 390,128.72 × 176,402.56
4. Step 4: Simplify right side
   260,104.72x = 68,819,704,937.52
5. Step 5: Solve for x
   x = 68,819,704,937.52/260,104.72
6. Step 6: Final answer
   x = 264,584.61